Overgrazing by cattle primarily contributes to desertification by ________
A) cattle outcompeting natural herbivores
B) spreading nonnative species
C) contaminating streams with cattle wastes
D) promoting erosion and loss of rooted plant cover
D
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A hundred years ago, how did farmers develop new varieties of squash to resist the squash borer insect pest?
A. crossbreeding B. genetic engineering C. natural selection D. artificial insemination
Why is soil conservation so vital to sustainable food production? Explain the terracing, contour planting, strip-cropping, alley cropping, shelterbelts, and conservation-tillage methods of farming used for soil conservation.
What will be an ideal response?
Fire tornadoes may carry fiery debris and drop it miles away, starting new fires, but their wind speeds do not get high enough to register on the Fujita Scale.
Answer the following statement true (T) or false (F)
A metapopulation is one in which genetic diversity is much reduced.
Answer the following statement true (T) or false (F)